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72125 - Block Diagram


1K x 16 Parallel-to-Serial FIFO, 5.0V

The 72125 is a 1K x 16 dedicated, parallel-to-serial FIFOs. The ability to buffer wide word widths (x16) make this FIFO ideal for laser printers, FAX machines, local area networks (LANS), video storage and disk/tape controller applications. Expansion in width and depth can be achieved using multiple chips. IDT's unique serial expansion logic makes this possible using a minimum of pins.


  • 25ns parallel port access time, 35ns cycle time
  • 50MHz serial output shift rate
  • Wide x16 organization offering easy expansion
  • Low power consumption (50mA typical)
  • Least/Most Significant Bit first read selected by asserting the FL/DIR pin
  • Four memory status flags: Empty, Full, Half-Full, and Almost-Empty/Almost-Full
  • Dual-Port zero fall-through architecture
  • Available in 28-pin 300 mil plastic DIP and 28-pin SOIC
  • Industrial temperature range (–40C to +85C)

Product Specification

Core Voltage (V)Bus Width (bits)Density (Kb)Pkg. CodeInterfaceI/O TypeOrganizationTemp. RangeArchitectureAccess Time (ns)
51616PE28, PT28, PTG28, PEG28Asynchronous5.0 V TTL1K x 160 to 70°CParallel/Serial FIFOs25, 50

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
72125L25SOObsoletePE28SOIC28CNoTubeCheck Availability
72125L25SO8ObsoletePE28SOIC28CNoReelCheck Availability
72125L25SOGActivePEG28SOIC28CYesTubeCheck Availability
72125L25SOG8ActivePEG28SOIC28CYesReelCheck Availability
72125L25TPObsoletePT28PDIP28CNoTubeCheck Availability
72125L25TPGActivePTG28PDIP28CYesTubeCheck Availability
72125L50SOObsoletePE28SOIC28CNoTubeCheck Availability
72125L50SO8ObsoletePE28SOIC28CNoReelCheck Availability
72125L50TPObsoletePT28PDIP28CNoTubeCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
72125 Data Sheet Datasheet PDF 241 KB Feb 10, 2016
PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Apr 14, 2016
PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Feb 15, 2016
PDN# : FS-15-02R1 PRODUCT DISCONTINUANCE NOTCE Product Discontinuation Notice PDF 546 KB Jul 23, 2015
show all (18)
PDN# : FS-15-02 Product Discontinuance Notice Product Discontinuation Notice PDF 548 KB May 21, 2015
PCN# : A1403-01 Add OSET as Alternate Assembly Product Change Notice PDF 67 KB Apr 3, 2014
PDN# : FS-13-03 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 55 KB Jul 25, 2013
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 14, 2012
PCN# F-0602-01R1 WAFER FAB PRODUCTION FROM FAB 2 TO FAB 4 Product Change Notice PDF 69 KB Jun 28, 2006
PCN# F-0602-01 WAFER FAB PRODUCTION FROM FAB 2 TO FAB 4 Product Change Notice PDF 69 KB Jun 21, 2006
PCN# : A-0605-05 AIT as Alternate Assembly Facility for SOIC/QSOP/SSOP/TSSOP/PDIP Product Change Notice PDF 298 KB May 25, 2006
PCN#: TB-0504-01, Transfer Test & Backend from IDT-Manila to IDT Product Change Notice PDF 35 KB Apr 29, 2005
PCN#: A-0501-01, New m/c DMC-2000 and d/a 8390A for PDIP pkgs Product Change Notice PDF 42 KB Jan 25, 2005
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB Dec 14, 2004
PCN#:A-0401-01, new m/c G600 & 8290 d/a material Product Change Notice PDF 196 KB Jan 19, 2004
PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB Oct 10, 2003
PCN# G-0203-05 Mold Compound Product Change Notice PDF 40 KB Apr 16, 2002
PCN# G0106-01, Moisture Sensitive Label Change Product Change Notice PDF 274 KB Jun 11, 2001
PCN# G0005-01, Laser Top Mark Product Change Notice PDF 24 KB May 10, 2000